Stripper mechanism



J. F. DAVIS STRIPPER MECHANISM Filed Sept.

March 9 1926.

Patented Mar. 9, 1926.

PATENT OFFICE.

I JOSEPH F. DAVIS, PORTSMOUTH, OHIO.

STRIPPER MECI-IANI$M.

Application filed. September 4, 1925. Serial No. 54,584.

To all whom it may concern:

Be it known that I, Josnrrr F. DAVIS, a citizen of the UnitedStates, and residing at Portsmouth, in the county of Scioto and State of Ohio, have invented a new and useful Improvement in Stripper Mechanism, of which the following Specification is a full disclosure. j

This invention relates generally to im provements in stripper, or squeezer devices for removing surplus impregnating material, such as hot wax, from thread used for sewing.

The invention is particularly designed for use in conjunction with thread waxing pots of sewing machines, wherein the thread, a fter passing into and out of the hot wax, is made to pass through a squeezer, stripper, or surplus wax remover, on its way to the stitching forming mechanism of a sewing machine r An object of the invention is to provide a squeezing or stripping device in which the thread engaging stripping portions can be adjusted so that larger or smaller amounts of surplus waxing material can be removed.

Other objects are to provide a stripper, the parts of which are easily accessible for cleaning, and in which one of the stripper members is yieldable in the direction of draft of the thread, to prevent breakage of the thread, the degree of yieldability being variable by the use of adjusting means. This adjusting meansalso permits the varying of the'tension of the thread.

The stripper device ordinarily consists of a thread engaging and stripping portion constructed of soft material'such as felt, which must be frequently renewed. Moreover,

there is no way of varying the degree of stripping or squeezing action.

My invention provides means for regulatfing thread tension, as well as the degree of stripping 'actlon, and permits ready loosen ing or tightening of the stripper-elements about the thread. I

Other objects and certain advantages will appear in the specification, and references "made to the drawings in wh1ch:

Figure '1 is a front View of a portion of a shoe stitching mach ne showing my invention applied to the wax pot thereof.

Figure 2 1s a SlClG. View of Figure 1.

Figure 3 is a plan of my improved stripper uni 1 Figure 4 is a longitudinal vertical section on line 4- l of Figure 3. v Figure 5 is a transverse vertical section on line 5-5 of Figure 8. I

The numeral 1 designates a portion of the frame of ashoe stitching machine, 2 the wax pot, and 3 the cover of the wax pot. My stripper device is attached to the top 3, and the elements of the device lie in a horizontal plane.

The stripper unit asherein shown, has two of my stripper devices, inasmuch as this is the number ordinarily employed in furnishing waxed thread for a lock stitch sewing machine. Two spools of thread 15 are used, andeach thread is brought from the spool over. a support 16 and downwardly, each through a respective opening 17 in the cover 3, thence each through a respective opening 9in guides 10 depending fromthe lower side of the cover. These openings are below the tension mechanism of the sewing machine.

The stripper devices are identical in structure and operation and therefore the description would apply to one only- Two of the devices are attached to the base plate 20 in which plate are the two thread receiving 7 openings 21, one for each stripper mechanism, and the cover has corresponding thread receiving openings 18in register with the openings 21. i

The devices are attached in parallel relation and are suitably spaced. Each device comprises two superposed elements, adj ustable toward and away from one another-in planes at'right angles, one slidably adjustable toward and away from the other in a direction-parallel therewith, and a second swingingly adjustable vertically in adirection at right angles to the slidable adjustable first mentioned element, toward and away from the upper face thereof.

The block or base has in its upper'surface two parallel dove tail grooves 25 and in each groove 25 intersects this opening so that the inner side of the plate may be adjusted across the opening in any degree. The plate has a right angular depending outer portion drilled for the reception 01 an adjusting screw 27 which has threaded engagement with the block, and between this depending portion and the block a coiled spring 28 is interposed for forcing the plate outwardly when the screw is turned in an appropriate direction. The outer end of the slidable plate has a notch or opening 30 therein extending in a direction longitudinal of the plate, and the position of this notch in respect to the opening 21 is clearly shown in Figs. 3 and 4:.

Pivoted as at 31, tothe block on its upper side, is a lever 32 adapted to be rocked in a vertical plane, and having a linger portion and an arm portion 84 overlying the slidable element 26. By pressing the outer end of the lever, the inner arm is made to approach or recede from the top surface of the slidable element, and this arm 84 has a notch or opening 35 extending inwardly from its end, and the notches face in opposite directions and are ofl'set in direction of overlap of the ad justable elements, so that when the thread is passed upwardly through said notches or openings a horizontal kink is caused to be formed between the adjustable devices.

Thus, the levers are overlappingly related and the notches ofiset in longitudinal direction.

The overlapping relation of the notches is for the purpose of providing the kink above referred to, and the relation is such that the thread engages the back wall of the lower stripping notch as well as the back wall of the upper stripping notch, providing the small horizontal portion extending between the adjustable members, engaged flatly by the opposing faces of the members.

It will be noted that the superposed notches are opposingly related lying in different horizontal planes, and that one is adjustable horizontally toward and away from the other, and across the opening 21 in varying degrees, in a plane parallel with the second element which is adjustable in a Vertical plane.

In order to regulate the tension on the upper element, or to change the spacing between the elements, a screw 40 passes loosely through an opening therein and has threaded engagement with the block 20, and a coil spring a1 is interposed between the top face of the arm 34 and head of the screw. Thus, an adjustable tension is provided for pressing the upper lever against the horizontal portion of the thread.

The length of the horizontal or kink portion may be increased or decreased accordin'gly'a-s the slide 26 is adjusted across the opening 21. "The tension on the thread may be entirely released by raising the arm of the upper lever. These adjustable stripper elements can be conveniently removed for pur poses of cleaning, and the tension of the thread can be adjusted in micrometric degree, to prevent breakage of the same and to obtain that exact degree of stripping or squeezing action necessary in devices of this kind.

It will be readily understood that the thread is passed downwardly through the wax, passes upwardly through the opening 21, through the offset notches or openings, and between the superposed elements 26, 34, the back walls of the notches or openings acting to strip the wax as the thread is pulled upwardly by the stitch forming mechanism. Although suitable devices are provided on the sewing machine for keeping thread in properly taut condition, thedevice herein provides auxiliary means for increasing or decreasing the thread tension and for controlling the degree of stripping action.

Having described my invention, I claim:

1. A device of the class described, com prising slidable, and pivoted elements, each element having a guide aperture, said elements superposed with the apertures relatively offset, and said elements adjustable toward and away from one another in planes at right angles. I

2. A device of the class described, comprising two elements adjustable toward and away from one another in planes at right angles to one another, each element having a guide aperture, said apertures offset in direction longitudinally of the elements.

3. In a device of the class described, a base, a lever pivoted thereto and having a thread receiving opening, an adjusting device for yieldingly pressing the lever towards the base, a slide attached to the base below the lever, translatable toward and away from the pivotal point of said lever, and having a thread receiving opening, said openings offset in a direction longitudinally of the slide and lever whereby a thread passed through the openings will scrape against the sides thereof and will have a portion lying between the slide and lever and compressed, or cornpressible therebetween.

l. In a device of the class described, a base having an opening therein, an element slidably adjustable across the opening, a lever element pivoted to the base having an arm overhanging the slide, said arm having an opening, means for adjusting the lever and yieldably pressing the same toward the slide, whereby the relation of the openings can be varied, by adjusting either slide or lever.

5. In a device of the class described including a base plate having an opening therein, an element slidably attached to said base, having a notch aligned with said opening and overhanging the same, said element adjustable across said opening, a lever element pivoted to the top of said block having an arm overlying said first mentioned element, each element having a terminal notch or opening, said notches or openings offset in a direction longitudinally of the adjustable elements, whereby a thread engaged through said base plate opening, and notches, or openings, has a portion lying between, and compressible between said elements.

(5. In a device of the class described, including a base, an element slidably'mounted on the base having a terminal notch, a second element pivoted to the top of said base having a terminal notch overlying said first mentioned element, said notches opposingly related, and offset in a direction longitudinally of the elements, whereby a thread 7 passed through the notches has a portion lying horizontally between the elements, engaged by the opposingly related faces of said elements, and means for adjusting and setting each element.

7. In a device of the class described comprising a base, an opening therein, an ele ment slidably attached to said base and adjustable across the opening, said element having a terminal notch overlying the opening, a second element pivoted at the top of the base adapted to swing in a plane at right angles to the first mentioned ele ment toward and away from the top face thereof, said second element having a terminal notch therein, overlying the first mentioned element and offset relative to the notch of the first element, in a direction longitudinally of the elements, and means for adjusting the elements in planes at right angles to one another.

In witness whereof, I hereunto subscribe my name.

JOSEPH F. DAVIS. 

